Furnace.



Patented neg. 9,1902.

No. 7l5,569.

s. FRANZ.

FURNACE.

(Applicntinn July 9, IDOL:

- (No Model.)

- [12% Raberj 5. f}

UNITED STATES PATENT OFFICE.

ROBERT S. FRANZ, OF ETNA, PENNSYLVANIA.

FURNACE.

SPECIFICATION formingpart of Letters Patent No. 715,569, dated December9, 1902.

Application filed July 9, 1901. Serial No. 67,614 (No model.)

To all whom it may concern.-

Beit known that I, ROBERT S. FRANZ, a citizen of the United States ofAmerica, residing at Etna, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inFurnaces, of which the following is a specification, reference beinghad'therein to the accompanying drawings.

This invention relates to certain new and useful improvements infurnaces of all kinds, such as boilers, heating-furnaces,p'uddlingfurnaces, and any kind of roller-millfurnaces, steel-millfurnaces, glass-house and gas-house furnaces; and the object of myinvention is to produce a furnace improvement and attachments theretowhich may be applicable to all kinds of furnaces.

A still further object of my invention is to construct a furnace and itsattachment in such a manner that by having compressed or forced air itmay be delivered in a heated condition into the fire-box throughcontracted air-pipes, so as to secure a more perfect and thoroughcombustion within the furnace.

A still further object of my invention is to apply a series of air-pipesabove and below the grate-bars or fireplace in such a position as tocreate a force draft of air in sufficient quantities in order to obtaina perfect combustion, also through 'pipes below the gratebars to theentire lower surface of the furnace, which, being forced upwardly to themass of burning fuel, causes an equal and perfect combustion and aregular heat from material that would not be valuable if burned byordinary methods.

' A still further object of my invention is to accomplish, by forcingthe supply of heated air into the combustion-chamber, a current ofairbeing directed in such a manner as to produce a whirling circulation orcounter crosscurrent of the products of combustion and at the same timea cross-pressure of air-blast, thereby securing an intermixture of theairsupply with the gases, effecting a complete burning of said gases andthe products of combustion carried therewith in suspension before theirfinal escape from the furnace or stack.

My invention further aims to construct a furnace of the above-describedclass that will be extremely simple in construction, strong, durable,and comparatively inexpensive to manufacture; furthermore, one that willbe highly efficient in its use.

With the above and other objects in view the invention consists in thenovel combination and arrangement of parts tobe hereinafter more fullydescribed, and. specifically pointed out in the claim.

In describing the invention in detail reference is had to theaccompanying drawings, forming a part of this specification, and whereinlike numerals of reference indicate corresponding parts throughout theseveral views, in which Figure 1 is a vertical sectional view of thefurnace. Fig. 2 is a longitudinal sectional view of a portion ofthefurnace. Fig. 3 is a sectional view looking down through lineocw,Fig. 2. Fig. 4 is a detail view showing one of the connections of themain air-supply pipes and the connection therewith. Fig. 5 is a similarview showing the manner of connecting the series of pipes to the mainair-supply pipe.

In the drawings the reference-numeral 1 indicates the furnace proper,and 2 represents the bridge-wall.

3 represents the grate-bars, and 4 the ashpit.

The reference 4 numeral 5 indicates the combustion-chamber, and 6represents the air-supply pipe. The air may be forced in said pipe bymeans of a fan or other suitable methods. The said air-supply pipeextends into the furnace under the bridge-wall 2 and has leadingtherefrom a number of perforated pipes 7, extending under the grate-barsdirectly under the combustion-chamber. From said supply-pipe 6upwardly-extending pipes 8 are connected to each side of the furnace,leading upwardly into the walls of the furnace and extends into thecombustionchamber, carrying pipes 9. These pipes 9 are perforated and.areembedded in the side walls of the furnace. Thus when air isintroduced into these pipes there will be two currents of air, one fromeach side wall, which will thus effectually cover the whole space abovethe grate-bars and between the side walls and tend to direct theunconsumed products into the fire.

The reference-numeral represents a lever, which is pivoted at 11 to thebracket 12. This lever carries a handle 14 and is pivoted at its lowerend to the rod 15. This rod 15 carries check-valves 16 to regulate thepipe 7.

The reference-numeral 18 represents a rod carrying a handle 19,operating the bell-crank 20, which carries a check-valve regulating thepipes 8.

The side walls are provided with passageways 9, which communicate withthe perforations 21 of pipes 9 and the interior of thecombustion-chamber.

The operation of my improved furnace is as follows: Air being forcedinto the supplypipe 6 will become heated when it enters the furnace andwill tend to heat the pipes '7, 8, and 9, thereby creating a hot blastboth below the grate-bars to increase the intensity of the combustionand also the blast in the combustion-chamber above the fire in adirection that will tend to direct the unconsumed products again intothe blaze. By this arrangement the smoke from the stack will be almostentirely eliminated.

The many advantages obtained by the use of my improved furnace will bereadily apparent from the foregoing description taken in connection withthe accompanying drawings.

It will be noted that various changes may be made in the details ofconstruction without departing from the general spirit of my invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The combination With a furnace, provided at its rear with a bridge-wall;of perforated air-pipes embedded in the side Walls of the furnace abovethe grate bars, and having their forward ends closed, a supply-pipearranged transversely of the furnace below the bridge-wall of thefurnace and having one of its ends projecting through the furnace-wall,vertical pipes arranged at the opposite sides of the furnace in the saidbridge-wall and communicating with the said supplypipe and perforatedair-pipes, a series of horizontally-disposed perforated pipes communicating with the said air-supply pipe, and arranged beneath the saidgrate, a check-valve mounted in each pipe of the said series, a rodconnected to each of the said valves, and a lever fulcru med to theexterior of the furnace and connected to the said rod, substantially asdescribed.

In testimony whereof I afiix my signature in the presence of twowitnesses.

ROBERT S. FRANZ.

Witnesses:

JOHN NOLAND, E. E. POTTER.

